Arachne Rates Maths

Assumptions

• 12 second boss kills, which is 112.5 bosses per hour.
• A perfect 100% quick place rate, which is easy to reach with the mod. See how to quick place.
• Without slayers: you kill 9 Brood and get the final hit on Arachne 20% of the time, using the best setup from the no slayers guide.
• With slayers: you kill 6 Brood and never get the final hit on Arachne, using the best setup from the T5 Spider Slayer guide, and you kill the boss mostly after Arachne spawns.
• Drop values are Ironman values, so Spider Essence is not sold.

Coins per kill (no slayers)

Coins per kill = base value x bestiary increase + Scavenger 6 + Scavenger Artifact + Raider's Sword + Midas Touch + Golden Dragon (5 x number of level 100 legendary pets) + 4 x Bank 5 + Champion 5

• Level 143 Arachne: 357 x 1.3 + 257.4 + 107.25 + 20 + 10 + 400 + 10 + 5 = 1,273.75
• Level 62 Arachne Brood: 20 x 1.3 + 111.6 + 46.5 + 20 + 10 + 400 + 10 + 5 = 629.1

Mob coins

• Per boss: (0.2 x 1,273.75) + (9 x 629.1) = 5,916.65
• Per hour: 5,916.65 x 112.5 = 665,623

Boss drops (Ironman)

• 31 Soul Strings per boss: 155,000
• 3 Enchanted String: 1,728
• 3 Enchanted Spider Eye: 1,440
• 0.5 Dark Queen's Soul: 2,500
• 0.02 legendary Tarantula pet sold to George: 2,000
• Per boss: 162,668
• Per hour: 162,668 x 112.5 = 18,300,150

Total, no slayers

18,300,150 + 665,623 = 18,965,773 coins per hour

With slayers

• Mob coins with 6 Brood and no final hit: 6 x 629.1 x 112.5 = 424,643 per hour
• Spawn cost: 112.5 x 100,000 = -11,250,000
• Toxic arrow poison: 112.5 x 12.87 x 64 x 20 = +1,853,280
• Slayer net: -9,396,720
• Total: 424,643 + 18,300,150 - 9,396,720 = 9,328,073 coins per hour

This does not count the extra coins from killing the slayer boss itself, which is not known yet.

Essence

• 1.25 pieces of Arachne armour per boss, salvaged for 7.5 essence (10 with the maximum essence bonuses)
• 30 guaranteed Spider Essence per boss
• Per boss: 40
• Per hour: 40 x 112.5 = 4,500

See maximising Spider Essence.

Shards

• 0.25 Arachne shards per boss
• 0.31 Arachne shards per boss from charm, with maximum charm stats and 9 mobs killed per boss
• Per boss: 0.56
• Per hour: 0.56 x 112.5 = 63

See maximising shard drops.

The formulas

• Bosses per hour = 3600 / (kill time + 20)
• Mob coins per boss = (final hit chance x Arachne coins) + (Brood killed x Brood coins)
• Coins per hour = bosses per hour x (mob coins per boss + drop coins per boss)
• With slayers, subtract bosses per hour x spawn cost and add the poison coins
• Essence per hour = essence per boss x bosses per hour
• Shards per hour = shards per boss x bosses per hour

Your own numbers

Change anything below and the results update. The defaults are the figures from this page.

Bosses per hour is worked out from your kill time as 3600 divided by (kill time + 20). A 12 second kill gives 112.5. You can also type your bosses per hour in directly. The session tracker in the mod shows your real bosses per hour.